Abstract
An integrating phase comparator, designed to indicate the phase angle difference between any two sine wave signals of nearly the same frequency over a fixed period of time is described. The input signal from the first generator is split in three signals differing in phase by 120° and then each one of these signals is individually modulated with the signal from the second generator. The resultant outputs are fed to drive a three-phase synchronous motor coupled to a gear operated counter mechanism. The total frequency difference, integrated over a fixed period of time, is obtained from the counter readings. The instrument is transistorized for continuous operation at low power consumption.
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